Monoazo dyestuffs



Patented Sept. 27, 1932 UNITED STATES" PATENT OFFICE HEINRICH noxnn AND EUGEN GLIETENBERG, or LnvnnxUsEN-oN-rHE-nnmn, GER- MANY, ASSIGNORS TO GENERAL ANILINE WORKS, INC., OF NEW YORK, N. Y., A

CORPORATION OF DELAWARE MONOAZO DYESTUFFS N 0 Drawing. Application filed January 3, 1931, Serial No. 506,491, and in Germany January 14, 1930.

The present invention relates to monoazo dyestuils, more particularly it relates to dyestufis which maybe represented by the general formula SOgH)n wherein R stands for an alkyl group containing at least one hydroxyl group, R stands for a benzene nucleus which maybe substituted by halogen, alkyl or oxalkyl, a? stands for hydrogen or a hydroxyl group, 1 stands I for hydrogen, alkyl or phenyl, n stands for one of the numbers 1 and 2 and wherein the benzene nucleus R may be substituted by halogen, alkyl, oxalkyl, the nitro group, the amino group or an acylamino group.

Our new dyestufls are generally bluish-red.

to bluish-black powders soluble in water and dyeing wool from an acid bath bluish-red to blue shades of good fastness properties.

The invention is illustrated by the following examples, without being restricted there- Example 1 337 parts by weight of ,4-nitro-1-aminobenzene-2-sulf-oxy ethylanilide, which can be produced, for example, by condensing 4- nitro-1-chlorobenzene-Q-sulfochloride with hydroxyethyl-aniline and exchanging the chlorine atom of the resulting condensation product for the amino group by means of ammonia (melting point -127128 0;), are diazotized. The diazo solution is caused to flow slowly into a solution of 239 parts by weight of Q-amino-8-hydroxynaphthalene-6- sulfonic acid, maintained weakly acid to Congo. A blue wool dyestuffs having in its free state the formula: T

SOIH

OaN HO- I. NH:

'soaN' LHFCHPOH is obtained, which besides other satisfactory fastness properties exhibits a Very good solubility. I

Ewample 2 wool dyestuif, which yields a somewhat greener shade than that of the dyestufi' of Example 1 but exhibits the same good solubility and similar good fastness properties The dyestutf has in its free state the formula - OZNO soan Nn-orn Example 3 By producing the .dyestuif produced according to Example 1 by means of sodium sulfide in alkaline solution a wool dyestufi' having in its free state the formula:-

which the benzene nucleus contains the amino group in the 4-position and which exhibits besides other satisfactory fas-tness proper ties a very good solubility.

Example 4 By acetylating the free amino group of the dyestufi produced in accordance with EX- ample 3 in the customary manner a displacement of the shade towards red takes place. The dyestuff thus produced, having in its free state the formula SOsH possesses in addition to other satisfactory fastness properties a Very good solubility.

We claim 1. As new products azo dyestuffs of'the general formula 1'.-

wherein R stands for an alkyl group containing at least one hydroxyl group, R stands for a benzene nucleus which may be substituted by halogen, alkyl or oxalkyl, :0 stands for hydrogen or a hydroXyl group, g] stands for hydrogen, alkyl or phenyl, n stands for one of the numbers 1 and 2 and wherein the benzene nucleus R may be substituted by halogen, alkyl, oxalkyl, the nitro group, the amino group or an acylamino group, said products being generally bluishred to bluish-black powders soluble in water and dyeing woolfrom an acid bath bluishred to blue shades of good fastness properties.

2. As new products azo dyestuffs of the general formula wherein R stands for an alkyl group containing at. least one hydroXyl group, R2,

1 shades ofgood fastness properties.

3. As a new product an azo dyestufi of the formula SOaH OzN HO OZN-O NH:

llHz-CH -OH; I

dyeing wool blue shades of good fastness properties.

4. As a new product an azo dyestuff of the formula:

B ena-on 0113-0 O-HN H SOnlI-O NH:

m-om-on dyeing wool red shades of good fastness properties.

In testimony whereof, we aflix our signatures. p

i HEINRICH HOYER.

I EUGEN GLIETENBERG. 

